Improvement in projectiles for ordnance



2 Sheets-Sheet. l.

H. HALVOIRSON Projectile.

Patented Spt. 29, 1863.

IIIIIIY-IIIIIIIII .r O m e m I WVUIue 5s 25 MPETERS, PHOTO-LUHQGRAPHER, WASHINGTON, n. O.

' 2 Sheets-Sheet 2,

H. HALVORSON.

1 Projectile. No. 40,142. laiaexNeri Sept 29, 1863.

M11 12 8 S e S Iuve O'l J J), L@ L APQ 7.95%

g M UNiTED STATES- P TENT @FFICFE.

BOSTON, MASSACHUSETTS.

IMPROVEMENT IN PROJECTl LES FOR ORDNANCE.

Specification forming part of Letters Patent No. 40, [42, dated September 99, 1863.

T0 at whom, it may concern;

Be it known that I, HALVOR HALVORSON, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented a certain new and useful Improvement on Shot 5 and I do hereby declare that the following is a full, clear,-and exact description thereof, reference being had to the accompanying drawings, and to the letters and marks thereon.

By the drawings forming part of this specification is represented a shot having my improvement, Figure 1 thereof being a view in elevation; Fig. 2, a View by vertical longitudinal section; Fig. 3, a view by like section or a base-plate and packing, and Fig. 4 a view of the lower end of the shot when the base plate and packing have been removed.

In each of these figures, when like parts are shown, like marks and letters are used to indicate the parts.

It will be noticed that this shot is of cylindrical form, having a concave head, a, with a sharp edge, I), so that. every point thereof rep resents a gouge, the. base or lower end of the shot also having a cavity, a, and this cavity 0 and that of the head a being connected by cylindrical space (Z.

At the bottom of the space (Z are openings 6 e e to curved or spiral channels fff, which terminate on the periphery at g .g g. A baseplate, 71., with packing z, fits into the concavity c and forms the lower sides of the channels f.

The gyration of the shot is expected to occur after it leaves the gun from the passage of the air through the central space, (Z, and the channels f and openings 9. It is obvious that as the projectile pursues its flight the air, rushing in at the mouth a through the central hole, d, will escape by the spiral channels f and openings 9 in a tangential current, as well as a lateral, and thus, acting against the exterior rectilinear current, will cause the shot to rotate.

From the base or lower end of the shot to the roof of the openings 9 the shot is of less diameter than the remaining forward section. The object of this is to enable me to construct this part of the shot so as entirely to fit the gun. This will give an accuracy of range belonging to no other projectile, to my knowledge, and the windage of the shot is confined to the smaller lateral section, where the air in rear of the shot, in being rammed home, will escape by the spiral channels and central hole.

The packing i, secured between the base j of the body of the shot and the base-plate, which is properly attached to the shot, may be of lead, copper, or any other suitable and yielding substance capable of so expanding against the bore of the gun on the explosion of the charge of powder behind it as to close the windage on the exit of the shot.

My improvement is applicable to all kinds and sizes of projectiles.

Instead of the central air-channel, extending from the concave head of the shot to and in connection with the channels and opening on the periphery of the shot, other channels from the head of the shot may be in connection with the channels and periphery-opening, and, instead of the concave base and conical base-plate, the base may be plain or at right angles to the side of the shot, and the base-p1ate and packing may be plain disks properly secured to the base of the shot.

WVhat I claim as my invention, and desire to secure by Letters Patent, is

Allowing the escape of the air on the ramming home of. the shot and preventing windage by diminishing the diameter of the shot at or near its base, in combination with the packing and base-plate and the air channels and openings, substantially as set forth.

This specification signed this 9th day of July, 1863.

HALVOR HALVORSON.

' \Vitnesses:

DAVID W. CHILI), TYLER R. WAsGArr, Jr. 

